他立即运行中心的轨道预测软件，计算小行星离地最近距离，然后打电话警告切斯利一场即将发生的小行星撞地球。
He ran it through MPC's orbit-projection software, which can tell how close an asteroid will come to Earth, and phoned Chesley to alert him of an impending collision.
你应该报告任何症状五氯酚直线距离，因为条件可以突然恶化，在没有警告的。
You should report any symptoms of PCP straight away because the condition can suddenly worsen without warning.
前面有通行高度限制的警告标志，用以预先警告驾驶人，并有辅助标志牌，说明限制生效的地点距离有多远。
Advanced warning of restricted headroom may be given by a restricted headroom ahead warning sign with a supplementary plate showing the distance to the restriction.
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